Macrophages induce the inflammatory response in the pulmonary Arthus reaction through Gαi2 activation that controls C5aR and Fc receptor cooperation

被引:89
作者
Skokowa, J
Ali, SR
Felda, O
Kumar, V
Konrad, S
Shushakova, N
Schmidt, RE
Piekorz, RP
Nürnberg, B
Spicher, K
Birnbaumer, L
Zwirner, J
Claassens, JWC
Verbeek, JS
van Rooijen, N
Köhl, J
Gessner, JE [1 ]
机构
[1] Hannover Med Sch, Abt Klin Immunol, Dept Clin Immunol, D-30625 Hannover, Germany
[2] Hannover Med Sch, Inst Med Microbiol, Hannover, Germany
[3] Univ Dusseldorf, Dept Biochem & Mol Biol 2, Dusseldorf, Germany
[4] Free Univ Berlin, Inst Pharmacol, Berlin, Germany
[5] NIEHS, Lab Signal Transduct, Dept Hlth & Human Sci, NIH, Res Triangle Pk, NC 27709 USA
[6] Univ Gottingen, Dept Immunol, D-3400 Gottingen, Germany
[7] Leiden Univ, Dept Genet, Leiden, Netherlands
[8] Vrije Univ Amsterdam, Dept Mol Cell Biol, Amsterdam, Netherlands
关键词
D O I
10.4049/jimmunol.174.5.3041
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Complement and FcgammaR effector pathways are central triggers of immune inflammation; however, the exact mechanisms for their cooperation with effector cells and their nature remain elusive. In this study we show that in the lung Arthus reaction, the initial contact between immune complexes and alveolar macrophages (AM) results in plasma complement-independent C5a production that causes decreased levels of inhibitory FcgammaRIIB, increased levels of activating FcgammaRIII, and highly induced FcgammaR-mediated TNF-alpha and CXCR2 ligand production. Blockade of C5aR completely reversed such changes. Strikingly, studies of pertussis toxin inhibition show the essential role of G(1)-type G protein signaling in C5aR-mediated control of the regulatory FcgammaR system in vitro, and analysis of the various C5aR-, FcgammaR-, and G(1)-deficient mice verifies the importance of Galpha(12)-associated C5aR and the FcgammaRIII-FcgammaRIIB receptor pair in lung inflammation in vivo. Moreover, adoptive transfer experiments of C5aR- and FcgammaRIII-positive cells into C5aR- and FegammaRIII-deficient mice establish AM as responsible effector cells. AM lacking either C5aR or FcgammaRIII do not possess any such inducibility of immune complex disease, whereas reconstitution with FcgammaRIIB-negative AM results in an enhanced pathology. These data suggest that AM function as a cellular link of C5a production and C5aR activation that uses a Galpha(12)-dependent signal for modulating the two opposing FcgammaR, FcgammaRIIB and FcgammaRIII, in the initiation of the inflammatory cascade in the lung Arthus reaction.
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页码:3041 / 3050
页数:10
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